Engine control, apparatus for a multicylinder engine

Abstract

In an engine control apparatus for a multicylinder engine including an injection pulse width-setting unit for setting an injection pulse width for an injection valve situated in each cylinder based on signals output from an engine operational condition-detection system situated in a vehicle; the injection pulse width-setting unit includes an engine starting injection pulse-setting unit for setting an injection pulse width for each cylinder in the engine starting operation, and the engine starting injection pulse-setting unit includes an injection pulse width-correction unit for determining a correction coefficient to a basic injection pulse width, for each cylinder at each cycle.

What is claimed is:  
     
       1. An engine control apparatus for a multicylinder engine including injection pulse width-setting means for setting an injection pulse width for an injection valve situated in each cylinder based on signals output from engine operational condition-detection means situated in a vehicle; 
       wherein said injection pulse width-setting means includes engine starting injection pulse-setting means for setting an injection pulse width for each cylinder in the engine starting operation, and said engine starting injection pulse-setting means includes injection pulse width-correction means for determining a correction coefficient to a basic injection pulse width, for each cylinder at each cycle, and wherein said injection pulse width-correction means determines a correction coefficient for each cylinder, to said basic injection pulse width, at the second cycle in the engine starting operation.  
     
     
       2. An engine control apparatus according to  claim 1 , wherein said injection pulse width-correction means determines injection pulse widths for said respective cylinders so that said injection pulse widths decrease in injection order of said cylinders, at least at the second cycle in the engine starting operation. 
     
     
       3. An engine control apparatus according to  claim 1 , further including variable valve timing-adjustment mechanism-driving means for changing the opening/closing timing of air-intake valves and gas-exhaust valves, which are situated at each cylinder. 
     
     
       4. An engine control apparatus according to  claim 1 , further including swirl-control valve-driving means for generating swirl flow in each cylinder. 
     
     
       5. An engine control apparatus according to  claim 1 , wherein said basic injection pulse width correction is based on a predetermined exhaust gas condition at the time of the starting of each cylinder with respect to the basic injection pulse width at each cycle. 
     
     
       6. An engine control apparatus for a multicylinder engine including injection pulse width-setting means for setting an injection pulse width for an injection valve situated in each cylinder based on signals output from engine operational condition-detection means situated in a vehicle; 
       wherein said injection pulse width-setting means includes engine starting injection pulse-setting means for setting an injection pulse width for each cylinder in the engine starting operation, wherein said injection pulse width-correction means determines a correction coefficient for each cylinder, to said basic injection pulse width, at the second cycle in the engine starting operation and as engine starting injection pulse setting means adjusts the injection pulse or an injection amount at each cylinder second cycle.  
     
     
       7. An engine control apparatus for a multicylinder engine including injection pulse width-setting means for setting an injection pulse width for an injection valve situated in each cylinder based on signals output from engine operational condition-detection means situated in a vehicle; 
       wherein said injection pulse width-setting means includes engine starting injection pulse-setting means for setting an injection pulse width for each cylinder in the engine starting operation, wherein said injection pulse width-correction means determines injection pulse widths for said respective cylinders based on a correction coefficient map which has been obtained in advance.  
     
     
       8. An engine control apparatus for a multicylinder engine including injection pulse width-setting means for setting an injection pulse width for an injection valve situated in each cylinder based on signals output from engine operational condition-detection means situated in a vehicle; 
       wherein said injection pulse width-setting means includes engine starting injection pulse-setting means for setting an injection pulse width for each cylinder in the engine starting operation, wherein said injection pulse width-correction means determines an injection pulse width for each cylinder based on the pressure in an air-intake pipe at the first cycle, and a pressure difference between the pressure in said air-intake pipe at the previous cycle and that at the current cycle.  
     
     
       9. An engine control apparatus for a multicylinder engine including injection pulse width-setting means for setting an injection pulse width for an injection valve situated in each cylinder based on signals output from engine operational condition-detection means situated in a vehicle; 
       wherein said injection pulse width-setting means includes engine starting injection pulse-setting means for setting an injection pulse width for each cylinder in the engine starting operation, wherein said injection pulse width-correction means determines an injection pulse widths for each cylinder based on the engine rotational speed at the first cycle, and an engine rotational speed difference between the at the previous cycle and that at the current cycle.